Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Reexamination Certificate
2005-09-06
2005-09-06
Martin, David (Department: 2837)
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
C318S286000, C318S466000, C318S468000, C318S471000, C318S432000, C318S433000, C049S028000, C049S031000
Reexamination Certificate
active
06940240
ABSTRACT:
A movable barrier operator can use (11) a first technique to prevent an excess application of force during controlled movement of a movable barrier (43) and at least a second technique (12) to similarly prevent an excess application of force during such movement. Both techniques can then be utilized to determine (13) when an application of excess force may nevertheless occur and not be reasonably avoided. In one embodiment, two techniques (21and22) can be used to detect force as applied during movement of the movable barrier and such information can be used to determine (23) whether applied force is being reliably indicated. In another embodiment, travel limit information (51), travel information (52) and travel history information (53) are utilized to assess whether normal operation of the movable barrier operator should be over-ridden (54) due to a possibly expression of undue force.
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Fitzgibbon James J.
Kelkhoff Barbara P.
Wilmott Colin B.
Colon Santana Eduardo
Fitch Even Tabin & Flannery
Martin David
The Chamberlain Group, Inc.
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